create polars equivalent of pandas_flavor

[samukweku]

PR Description

Please describe the changes proposed in the pull request:

• polars equivalent of pandas_flavor

This PR is related to #1352 .

PR Checklist

Please ensure that you have done the following:

1. [x] PR in from a fork off your branch. Do not PR from <your_username>:dev, but rather from <your_username>:<feature-branch_name>.
2. [x] If you're not on the contributors list, add yourself to AUTHORS.md.
3. [ ] Add a line to CHANGELOG.md under the latest version header (i.e. the one that is "on deck") describing the contribution.
   • Do use some discretion here; if there are multiple PRs that are related, keep them in a single line.

Automatic checks

There will be automatic checks run on the PR. These include:

• Building a preview of the docs on Netlify
• Automatically linting the code
• Making sure the code is documented
• Making sure that all tests are passed
• Making sure that code coverage doesn't go down.

Relevant Reviewers

Please tag maintainers to review.

• @ericmjl

[ericmjl]

🚀 Deployed on https://deploy-preview-1374--pyjanitor.netlify.app

[ericmjl]

Whoa, holy smokes, does this actually work, @samukweku?!?!?!

I was expecting the solution to be more complex!

[samukweku]

@ericmjl even i was surprised. Still waiting for the other shoe to fall off.

[samukweku]

@ericmjl if it is ok with u, I'd like to get #1377 in before the new release